
5.2 Troubleshooting
27
5 LED Indicators and Troubleshooting
Version 1.0 8/00
This chapter helps you to localize faults after they have been indicated (by LEDs or signal contacts). Please also refer
to the description of the LED indicators in 5.1, p. 25.
Fault indicated on the system LED
See description of the LED indicators in 5.1, p. 25.
Fault indicated on CH1
Check the following:
the DIL switch S0 is in Position 1 if the OLM is connected to the electrical star segment of a star topology
(see Chap. 3.2 ”Star topology“, p. 12).
the fault is still displayed after removal of the RS485 connector.
Still displayed:
Device is defective*.
Replace the OLM.
No longer displayed: The fault lies in the RS485 bus segment.
Check
– all RS485 connectors as described in 4.4.3 ”Connecting the electrical RS 485 bus lines“,
p. 22
– the structure and shielding of the RS485 bus segment
– the RS485 bus segment using a PROFIBUS bus monitor
– the configuration of all bus subscribers.
* This is not the case if the monomaster of a PROFIBUS network is connected to the RS485
bus segment which is to be examined. Replace the OLM concerned with another OLM from
the network, and then carry out the test described above.
If the OLM still malfunctions when connected elsewhere, the device is defective.
Replace the OLM.
If the OLM does not malfunction elsewhere, the fault lies in the RS485 bus segment.
Carry out the measures described above.
Fault indicated on CH2 / CH3
1. Check the following:
optically only modules of the same type are connected together (see 3, ”Network topologies“, p. 9)
the optical fiber has been approved for the module type being used, and that it does not exceed the permitted
length (see Table 1, p. 6)
the optical ports, which are connected via optical fibers, have been set to the same operating mode (see 4.3,
”Setting compatibility, operating mode and transmitting power“, p. 17)
the settings given in 4.4.1, ”Connecting the optical lines“ (p. 20) have been observed when connecting and laying
the optical bus lines.
5.2 Troubleshooting
Summary of Contents for SIMATIC NET PROFIBUS
Page 10: ...Contents viii PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 ...
Page 11: ...PROFIBUS NETWORKS 1 ...
Page 26: ...PROFIBUS NETWORKS 1 16 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 ...
Page 241: ...A 1 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 Testing PROFIBUS A ...
Page 254: ...Testing PROFIBUS A 14 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 ...
Page 288: ...Installing LAN Cables C 26 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 ...
Page 325: ...F 1 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 Dimension Drawings F ...
Page 338: ...Dimension Drawings F 14 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 ...
Page 396: ...Infrared Link Modul ILM 6ZB530 3AC30 0BA1 54 Copyright by Siemens ...
Page 434: ......
Page 438: ...Contents ii PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 02 Contents ...
Page 450: ...Network Topology 4 4 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 02 ...
Page 458: ...Installation and Startup 5 8 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 02 ...
Page 460: ...Troubleshooting 6 2 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 02 ...
Page 464: ...Technical Specifications 7 4 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 02 ...
Page 468: ...References 9 2 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 02 ...
Page 470: ...Abbreviations 10 2 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 02 ...
Page 478: ...References I 4 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 ...
Page 488: ...Glossary Glossary 8 PROFIBUS Networks SIMATIC NET 6GK1970 5CA20 0AA1 Release 2 05 2000 ...